Propeller driving unit



Aug, 30, 1949. E. H. DESMOULIN$ 2,430,305

' PROPELLER DRIVING UNIT Filed May 25, 1940 2 Sheets-Sheet l t w E-l F 1 Aug. 30, 1949. E. H. DESMOULINS 2,480,806

PROPELLER DRIVING UNIT Filed May 25, 1940 2 Sheets-Sheet 2 Patented Aug. 30, 1949 PROPELLER DRIVING UNIT Emile Hyacinthe Deamoulins, Issy-les-Moulineanx, France In France March 7. 1939 Application May 25, 1940, Serial N0. 337,296

Section 3, PublicLaw 690, August s, 1946 Patent expires March 7, 1959 The present invention relates to propeller drivlog units of the character set forth in my copending application Serial No. 246,252 filed December 17, 1938, and it is an object of the present invention to provide a transmission for oppositely driven propellers for airplanes, boats and similar motor driven vehicles wherein the speed of rotation of the propellers may be controlled in an eiilcient and economical manner while being driven from one and the same motor.

Other objects of the invention will be in part obvious and in part pointed out hereinafter.

In the accompanying drawings:

Fig. 1 is a vertical longitudinal sectional view of a propeller driving unit embodying the present invention, and

Figs. 2 to '7 are similar views showing slightly modified forms of the invention.

That form of the invention shown in Fig. 1 of the drawingsv comprises two coaxial propellers I and 2 secured to the outer ends of the driven shafts 3 and 4 respectively. The internal shaft 3 has journalled thereupon the tubular shaft 4 and fixed to, the respective inner ends of these shafts are the sun gears 5 and 6. The driving shaft 8 extends coaxial with the shafts 3 and 4 and freely journalled upon the shafts 4 and 8 is a carrier I. Theplanetary pinions 9 and I are rotatably mounted upon the carrier 1 and the pinions 9 are in mesh with the sun gear 5, whereas the pin-ions Ill are in mesh with the sun gear 6. The internal orbital driving gear II meshes with the pinions 9 and is secured to a carrier secured to the driving shaft 8. The gear housing I4 which is provided with a bearing for the tubular shaft 4 has also secured thereto a stationary internal orbital gear I3 which latter meshes with the pinions II]. All of the gears herein are of the spur gear type and the pinions 9 and III all have the same radius and are coaxially arranged in pairs upon the carrier 1. The sun gears and 6 are also coaxially arranged and of the same interior diameters.

In Fig. 2 I have illustrated the use of either spur teeth or bevel teeth gears and the axis of rotation of the planetary pinions being arranged at an angle with respect to the perpendicular axis of rotation of the sun gears. The sun gear 5a as carried by the driven propeller shaft 3 is less in diameter than that of the sun gear to carried by the driven propeller shaft 4. The orbital gear Ila secured to the carrier In of the driving shaft 8 is of less diameter than that of the internal diameter of the stationary orbital gear I3a carried by the gear housing Ma. The carrier Ia 2 Claims. (01. 170-13528) is rotatably supported upon the driving shaft 8' and has journalled for rotation. thereupon sets of intermediate pinions. Each set of pinions comprises an inner pinion 9a of less diameter than that of the outer pinion Illa. The pinions 9a are each in mesh with the sun gear-5a and the orbital driving gear I2a, whereas the pinions I00 are each in mesh with the sun gear I3a. From this arrangement it will be noted that due to the angle of rotation of the pinions 9a and Ilia the teeth of the sun gears 5a and So will be in prolongation to one another and the teeth of the orbital gears IIaand I30 are in prolongation of one another.

In Fig. 3 of the drawings the gears attached to the propeller shafts 3 and 4 are internal orbital gears 5b and 612 respectively and are in mesh with the pinions 9b and "lb mounted upon the carrier 7b. The sun gear I lb secured to the carrier IZb of the driving shaft 8b is in mesh with the pinions 9b, whereas the stationary sun gear I3?) is secured to an inward extension of the gear housing Mb. The carrier 1b is provided with bearings rotatably supported upon the outer end of the shaft 8 and the inward extension of the housing I4b. In this form of the invention the axis of rotation of the pinions is concentric with that of the driving shaft 8 and the diameter of the sun gears are the same, whereas the interior diameter of the orbital gears are the same.

In the modification of the invention as shown in Fig. 4 the gears may be of the beveled type and the axis of rotation of the planetary pinions being arranged at an obtuse angle with respect to the driving shaft, but at an angle opposite to that of the axis of rotation of the pinions as shown in Fig. 2. The gears 50 and carried by the propeller shafts 3 and 4 respectively are of different diameters, but concentrically arranged with respect to one another. A sun gear I la is secured to the carrier I2c carried by the driving shaft 8 and the stationary gear I3c of greater diameter than that of the sun gear He is fixed to the gear housing I 40. The carrier I0 is Journalled upon the driving shaft 8 and the intermediate pinions 9c and I00 are ,freely mounted for rotation upon this carrier 1c. The pinions are in mesh with the gears 50 and I I0 whereas the pinions IIlc are in mesh with the gears 6c and I30.

The arrangement as shown in Fig. 5 of the drawings the sun gear 5d and 6d secured to the propeller shafts 3 and 4 respectively are of different external diameters, the interior diameters of the orbital gears II d and I3d are also of different internal diameters and the intermediate whereas the gear lid is secured to a carrier lid driven by the driving shaft 8.

In Fig. 6 of the drawings the carrier is is iournalled for rotation about the coaxial shafts 3 and 8 and the beveled gear pinions 9e and lie are mounted therefore for rotation in planes parallel with these coaxial shafts 3 and 8. The sun gear 5e carried by the propeller shaft 8 and the gear lie of equal diameter therewith carried by the driving shaft 8 are in mesh with the pinions 9e, whereas the pinions llle of diameters less than that of the pinions 8e are in mesh with the stationary gear l8e carried by the gear housing Me and the gear is carried by the propeller shaft 8.

In Fig. 1 of the drawings 1 have illustrated another form of the invention in which the carrier If as journalled for rotation upon the shafts 3 and 8 carries intermediate pinions arranged in sets of four each and these pinlons are of the beveled teeth type.

'Each set of pinions are formed integral so as to jointly rotate together.

The pinions 8a are in mesh with the gear 5! carried by the propeller shaft 8; the plnions 9b are in mesh with the gear Iif secured to the carrier i2] driven by the shaft 8; the pinions lib are in mesh with the stationary gear "I carried by the gear housing II} and the pinions Ila are in mesh with the gear 6! carried by the propeller shaft 4.

I claim:

1. A propeller driving unit comprising in combinationa driving shaft, a driving gear connected to said shaft, a driven shaft, a tubular driven shaft journalled upon said driven shaft, said driven shafts being coaxially arranged with said driving shaft, a propeller carried by one end of each of said driven shafts, a driven gear carried by the opposite end of each of said driven shafts, a carrier freely rotatable about said driving shaft, a pair of bearings formed in said carrier with the end of said driving shaft rotatable in one bearing and said tubular shaft rotatable in the other of said bearings, sets of compound planetary pinions freely iournalled upon said carrier,

a stationary orbital gear, one pinion of each set being in direct gear engagement with said stationary orbital gear and said driven gear carried by said tubular driven shaft and the other of said pinions of each set being in direct gear engagement with said driving gear and said driven gear carried by said driven shaft.

2. A propeller driving unit comprising in combination a driving shaft, a carrier secured to the front portion of said driving shaft and extending therefrom, an internal driving gear connected to said carrier and positioned concentric with said driving shaft, a driven shaft, a tubular driven shaft journalled, upon said driven shaft, a pair of propellers each connected'to the outer end of one of said driven shafts, a sun gear carried bythe inner end of each driven shaft, said sun gears being of the same external diameter, a second carrier, a pair of bearings formed in said second carrier and having the frontend of said drivin shaft rotatably supported in one bearing and said tubular shaft rotatably supported in the other bearing, sets of planetary pinlons freely rotatable upon said second carrier and having the same external diameter, a stationary orbital gear having internal teeth of the same diameter as that of said internal driving gear, one pinion of each set being in gear engagement with said sun gear carried by said tubular shaft and said stationary orbital gear and the otherv pinion of each set being in gear engagement with said sungear carried by said driven shaft and said internal driving gear.

EhflLE HYACINTHE DESMOULINS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS. 

